Interesting question. Maybe because some of them - e.g., Steph, Tiff, Kristina and Megan - are beautiful and have lovely slim bodies, the way we would all like to be, but they can exhibit awful character traits. So they look like angels but are horrendous. And this gulf between appearance and reality dismays us. Society judges the women on the disparity between their looks/bodies and their bullying, conniving, betraying, greedy, swearing, dirty or unhygienic ways.
The men can be equally awful in some ways but society forgives them any disparity between the way they look and the way they actually are. - Simply because men are generally not judged on their looks. So Jeremy is thought of as sweet and lovely and in fact has behaved disgustingly with Steph - in love one day and then totally off the next.
Conversely e.g., Gemma, she is condemned for exhibiting characteristics that match or reinforce her body image. Compare Christopher - not great in body or character sometimes, but regarded with affection and pity.
So women can't win! Either they disappoint (lovely body/awful character) or they reinforce (ugly inside and out) our expectations. We do not view the men's characters in the context of their looks.